Spot The Problem
- Thread starter Iggifer
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Yes, quite possibly, although that's a rather ironic form of 'compensation'.
In fact, on looking again at those conductors, I think the things we've been accusing of being single-insulated cables on the wall are probably double-insulated. What I thought was a 'fat' conductor going into the RCBO seems to actually be a red-sheathed and red-insulated conductor of fairly modest CSA - so, as you say, probably a lighting circuit.[/quote]
Kind Regards, John
Indeed
As I've just written, I suspect it may be a red-sheathed and red-insulated cable - probably the same one which (accused of being single-insulated) we see going down the wall.
Kind Regards, John
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To clear a few things up, apologies I haven't checked in for a while
The 'thick' Red and Blacks are DI lighting singles, but there is also another lighting circuit with T+no E feeding lights
Mostly all 45-50ish years old, all in ally except for a cooker circuit and the CH that BG installed.
Board clearly isn't 50+ years old so suspect BG conned the lady into a board change
And, the fault I was alluding to, was the almost pointless RCBO in ways 1+2 supplying the lights with no earth. Of course it can operate with no earth, but I don't get the thinking behind "there's no earth so I'll put it on an RCD" rather than actually correcting the fault / posting a warning label - which are the appropriate ways to deal with no earth[/list]
The 'thick' Red and Blacks are DI lighting singles, but there is also another lighting circuit with T+no E feeding lights
Mostly all 45-50ish years old, all in ally except for a cooker circuit and the CH that BG installed.
Board clearly isn't 50+ years old so suspect BG conned the lady into a board change
And, the fault I was alluding to, was the almost pointless RCBO in ways 1+2 supplying the lights with no earth. Of course it can operate with no earth, but I don't get the thinking behind "there's no earth so I'll put it on an RCD" rather than actually correcting the fault / posting a warning label - which are the appropriate ways to deal with no earth[/list]
He was indeed. +10 internet points for him
Not quite sure what's wrong with that though, it comes from the circuit in way 3
If your changing a bulb in a plastic holder and accidentally touch the line pin then the rcbo will trip.
So it's not pointless.
So it's not pointless.
Whilst touching what else?
That depends upon the answer to the above question.
Kind Regards, John
IIRC the ESC best practice guide for changing consumer units incorporating lighting circuits with no cpc recommended the use of RCDs (before the other requirements for RCDs on lighting circuits)
Yes, I heard something along those lines.
So if you're changing a consumer unit and the lights have no earth, whether you use an RCBO or not, you're not really making it any worse, are you?
It's very common to come across old lighting circuits that were wired with a combination of twin+earth and just twin.
So if you're changing a consumer unit and the lights have no earth, whether you use an RCBO or not, you're not really making it any worse, are you?
It's very common to come across old lighting circuits that were wired with a combination of twin+earth and just twin.
The ESC guide says only to fit an RCD/RCBO if IR tests at less than 1 mΩ
http://www.esc.org.uk/fileadmin/user_upload/documents/industry/best_practice/BPG1v2_web.pdf Page 9
I do agree, it's not making things worse, but in this case, there were brass switches and fittings throughout regardless
Presumably the floor? Ideally, a bonded pipe
You mean 1MΩ. I presume.
It doesn't say ONLY if
On page 7 it says you should decline replacement of CU if <1MΩ but ALSO if customer refuses fitting of CPC then fit an RCD.
Then, as you point to, page 9 says if resistance <1MΩ fit RCD.
Typical.
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